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Related Concept Videos

Computed Tomography01:10

Computed Tomography

Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...
Imaging Studies for Cardiovascular System V: CT01:28

Imaging Studies for Cardiovascular System V: CT

Cardiac computed tomography (CT) scanning is an advanced cardiac imaging technique that utilizes CT technology, with or without intravenous (IV) contrast, to produce accurate cross-sectional virtual slices of specific areas of the heart, coronary circulation, and major blood vessels such as the aorta, pulmonary veins, and arteries. The computer processes these slices to generate three-dimensional images. Multidetector CT (MDCT) is a rapid form of CT scanning that captures multiple slices...
Imaging Studies I: CT and MRI01:14

Imaging Studies I: CT and MRI

Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...
Positron Emission Tomography01:29

Positron Emission Tomography

Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body being...

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Related Experiment Video

Updated: Jun 26, 2026

Human Brown Adipose Tissue Depots Automatically Segmented by Positron Emission Tomography/Computed Tomography and Registered Magnetic Resonance Images
09:21

Human Brown Adipose Tissue Depots Automatically Segmented by Positron Emission Tomography/Computed Tomography and Registered Magnetic Resonance Images

Published on: February 18, 2015

Helical multidetector row quantitative computed tomography (QCT) precision.

Michael Bligh1, Luc Bidaut, R Allen White

  • 1Radiation Oncology Centers of Southwest Florida, Bradenton, FL, USA.

Academic Radiology
|January 7, 2009
PubMed
Summary
This summary is machine-generated.

Quantitative computed tomography (QCT) precision varies with helical multidetector-row scanners. Best-case precision is 1.4%, routine is 1.8%, and worst-case is 3.6%, necessitating caution for bone mineral density change assessment.

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Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
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Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease

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Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
09:30

Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease

Published on: December 18, 2016

Area of Science:

  • Radiology
  • Medical Imaging
  • Bone Densitometry

Background:

  • Quantitative computed tomography (QCT) precision studies predated helical scanning and multidetector-row scanners.
  • Current QCT systems utilize advanced helical multidetector-row technology.
  • Understanding parameter impact on QCT precision is crucial for accurate bone mineral density (BMD) assessment.

Purpose of the Study:

  • To evaluate helical multidetector-row QCT precision using current scanners.
  • To identify factors influencing QCT measurement precision.
  • To establish precision benchmarks for contemporary QCT systems.

Main Methods:

  • Examined effects of CT parameters (voltage, current, pitch, rotation speed, detector, table height, reconstruction) and scanner variation.
  • Utilized two QCT systems with seven multidetector-row CT scanners in helical mode.
  • Assessed precision (coefficient of variation) in best-case, routine-case, and worst-case scenarios with ex vivo spine specimens.

Main Results:

  • Best-case QCT precision was 1.4% with a fixed BMD scan protocol.
  • Routine-case precision, allowing some protocol variation, was 1.8%.
  • Worst-case precision, with unconstrained clinical QCT, was estimated at 3.6%.

Conclusions:

  • Identified significant precision variations based on QCT acquisition parameters and scanner settings.
  • Even small errors at single time points can accumulate, impacting longitudinal BMD change assessment.
  • Emphasized the need for meticulous attention to detail and protocol consistency in helical multidetector-row QCT for monitoring BMD.